Adjustable Dumbbell Cam Pawl Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional adjustable dumbbells require permanent extension carriers or tracks on the handle bar, limiting adjustability and increasing length, and do not allow for easy attachment or detachment of additional weight rings.
Innovation Solution
An adjustable dumbbell assembly with a handle bar, housing, pawl, and actuating device that includes a cam member to engage and detach weight elements, allowing for quick weight adjustments without extension carriers or tracks, enabling the attachment of additional weight members and reducing overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extension carriers or tracks are permanently formed on the end portions of the central handle bar, then the adjustable dumbbell can securely hold weight rings, but the total length of the dumbbell assembly greatly increases
Solution Approach 1:
The patent merges the extension carrier function with the handle bar itself by forming guide channels directly on the handle bar surface. This eliminates the need for separate extension carriers that would increase length, while maintaining the weight ring attachment capability through the integrated guide channels and pawl mechanism.
Solution Approach 2:
The pawl mechanism is nested within the guide channel structure on the handle bar. The pawl slides within the guide channel and engages with weight rings, creating a compact nested arrangement that provides secure holding without extending the overall dumbbell length.
2Reliability
If extension carriers or tracks are permanently formed on the end portions of the central handle bar, then the adjustable dumbbell can securely hold weight rings, but the structure becomes more complex
Solution Approach 1:
The guide channels are formed directly on the handle bar surface, merging the carrier function into the existing handle bar structure. This reduces device complexity by eliminating separate extension carrier components while maintaining secure weight ring holding through the integrated guide channel and pawl system.
3Adaptability or versatility
If the handle is used for attaching or detaching weight rings, then the adjustable dumbbell becomes more versatile, but the attachment and detachment process becomes more complex
Solution Approach 1:
The handle bar is given multiple functions: it serves as the grip handle and simultaneously as the mounting structure for weight rings through the guide channels. This universal design allows the handle to perform both gripping and weight attachment functions without requiring separate specialized components.
Solution Approach 2:
The pawl mechanism is designed to be manually operated by the user through simple pushing or pulling motions. The user directly manipulates the pawl to engage or disengage weight rings from the guide channels, making the attachment system self-service without requiring complex external actuating mechanisms.
4Ease of operation
If a cam member is used in the actuating device, then the pawl can be quickly actuated to engage or detach weight elements, but the device complexity increases
Solution Approach 1:
The cam member converts rotational motion of the actuating device into linear motion of the pawl. As the cam rotates, its profile pushes the pawl to move rapidly between engaged and disengaged positions, enabling quick weight adjustments through a simple rotational action rather than complex multi-step operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and quick weight adjustments without the need for extension carriers, allowing for a more compact design and the ability to attach various weight rings, enhancing usability and versatility.
Implementation Method 1
an actuating device rotatably engaged onto the handle bar and including a cam member for engaging with the pawl and for actuating the pawl to engage with the weight element
Data Source
AI summary
An adjustable dumbbell device includes a handle bar, a housing attached to one end of the handle bar, a weight element engageable into the housing, a pawl slidably received and engaged in the housing, and an actuating device rotatably engaged onto the handle bar and having a cam member for engaging with the pawl and for actuating the pawl to engage with the weight element and for detachably anchoring the weight element to the housing and the handle bar. The housing includes a guide channel for slidably engaging with the pawl, and a guide pin engaged with the pawl for guiding and limiting the pawl to slide relative to the housing.